问题 选择题

根据粒子结构示意图给出的信息,下列说法正确的是(  )

A.①和②表示的微粒属于同种元素

B.③表示的微粒属于阴离子

C.①和②形成的化合物化学式为NaO

D.③表示的微粒相对原子质量为17g

答案

答案:B

题目分析:A、决定元素种类的是质子数(即核电荷数),①和②两种微粒的核内质子数分别是8、11,核内质子数不同,表示的微粒属于不同种元素,错误;B、③微粒的质子数=17,核外电子数=18,质子数<核外电子数,为阴离子,正确;C、微粒①带有两个单位的负电荷为氧离子,氧元素的化合价为﹣2价;微粒②带有1个单位的正电荷为钠离子,钠元素的化合价为+1价;由钠离子和氧离子形成的化合物的化学式为:Na2O,错误;D、相对原子质量单位是“1”,不是“克”,常常省略不写,错误。

判断题
阅读理解

Having friends may well keep you healthier and help you deal with stress better. Some studies show that people with close friends have a greater ability to fight disease than people who are alone.

Make friendship a priority. Find the time to be with friends even if it means letting the grass in your garden uncut or the dishes unwashed for a while. When you can’t get together, use the phone to keep in touch.

Open up to close friends. Maintaining a deep friendship requires a level of “heartfelt” intimacy (亲密). Don’t be afraid to express your inner fears and disappointments. Listen to your friends when they have problems,but offer advice only when it’s wanted. Help raise friends’ self-esteem (自尊)when they are shaken by a job loss, or other such events.

Have different friends for different activities, such as going to the movies,singing in a choir,and joining in a bowling league.

Don’t wait for a friend to ask a favor. When a friend has the flu,offer to go to the store or drive his or her children to their after­school activities.

Never take a friendship for granted. Like a good marriage,friendship needs care and patience. Become a joiner. Find a group that matches your interests.

Talk to strangers. Conversations started in museums, laundry rooms,or bookstores can lead to firm friendship.

Enroll in an adult­education course. A classroom is an ideal place to meet others with similar interests.

小题1: People with close friends have a ________ ability to fight disease than people who are alone.

A.less

B.greater

C.poorer

D.little小题2: According to the passage,you’d better offer advice to your friends ________.

A.at any moment

B.only when they are happy

C.only when they want it

D.only when you are glad小题3:How many things have been mentioned that we must pay attention to in the passage to have friends?

A.3

B.4

C.6

D.7小题4:Which of the statements is TRUE according to the passage?

A.You should have different friends for the same activities.

B.You should wait for a friend to ask a favor.

C.You should avoid talking with strangers in museums, laundry rooms, or bookstores.

D.You should never take a friendship for granted.小题5:The underlined word “enroll” in the last paragraph means________.

A.give

B.join

C.get

D.catch